Just got done mic'n my 84 Windsor block. It's definitely 0.040" over... most of the hole are at 4.0405 to 4.0413 and one a little tight at 4.0395. Just wondering if that's an issue. Can't find specs of max cylinder to piston clearance... Probably just looking in the wrong places. I want to go 393 or 408 stroker for my 66 F250. TIA.